Amazon just announced that Prime Big Deal Days, its fall version of Prime Day, will run Oct. 6-7.

The 48-hour sale kicks off at 12:01 a.m. Pacific on Oct. 6, with deals in more than 35 categories and fresh batches dropping at midnight, 8 a.m. and 1 p.m. Pacific.

That part is the same old October ritual. Here’s what’s new.

Alexa can now set deal alerts by category, show up to 365 days of price history on a product, and let you set a target price on any item.

And then there’s the headline feature: Auto-Buy. Flip it on, and Alexa purchases the item for you the moment it hits your target.

So here we are. A retailer built a button that can spend your…

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